phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('e7972e84f15d3389a3197306836e783a', -1, 1713972514, 1713972514, '12768c6c', 6, 0, 0)

Line : 187
File : sessions.php